As per as the Antivirus is concerned my vote goes to ’’Trend PC Cillion ’’
The reasons why I suggest you this one is :
The major fact behind any antivirus is flexibility of upadating.. each and every Virus needs to be up dating every week...
This is very easy to update and also it has got auto update facility...So very easy to update...
Secondly , It requires very less hard disk space compared to other antiviruses....
Thirdly ... it has a very flexible real time scan system...compared to any other antivirus systems..
As an Hardware Engineer I used almost all the Antivirus softwares ..i feel this is the best ....
You just check this out (https://antivirus.com)
and contact me if u have anymore doubts...
With warm regards,
Haneef